I am getting the error message while Running my code .

Nonlinear iteration is not converging with step size reduced to hmin (3.22191e-17) at time 0.00906886. Try reducing

the minimum step size and/or relax the relative error tolerance

[Walter Roberson]

please tell us more about what you are doing.

[PRITAM KUMAR NIRALA]

I am trying to optimize the Kp&Ki value 8 PI controller i.e i have 8Kp and 8Ki to be optimize by PSO and i am getting this responce please help me.

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/756869-how-to-solve-this-error-error-nonlinear-iteration-is-not-converging-with-step-size-reduced-to-hmin#answer_636039

As far as I can see that is a Simulink message, However, the particle swarm algorithms use randomness and so are probably not compatible with using any of the variable step ode algorithms such as ode15s